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Full text of "Text Book Of Mechanical Engineering"

454

Crane Hooks,

used at Elswick, and has been well tested, the diagram being
given at Fig. 413,

WROUGHT IRON CRANE HOOKS (ELSWICK PRACTICE}. .

1
 1-
		Tons.
	A.
	B.
	c.
	D.
	E.
	•      P.
	G.
	H.


	
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	2I
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i
	
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		r
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 o
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	5

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a ,
		
	
		
	
		
	
	
ifij  •
 Taking O = 2, we have,-by formula.,/. 453, in tons and inches,
										
E
	i        *                              21 tons hook : ^ = 9*28, /=5,
					2=6-2
				
i
	j'                                                                              -         21          21 X
					5
				
i
	• '              rv?&       ft*    v
					— 2 26 + 8 47 — -"-^ 73 tons.
				

	$ tons 'hook: # = 3*95,   r=2
					'97j 2) = i'32
				
i
	1   »
 M'              '                                          .      / '1                                                         • '    J
			_   5   H.5X2'<
		^ — 1*27 + 5 '62 — 6 9   tons.              *
				
				f> 'r\t*         T-'^rtvx
						
•
	t||-                                                             c> yo    * 6^ ^ *
									
I
	<v                                  i ton hook : a= 2,        r= 2
					'i5> Z=  -5
				
•
	P/ '
					
				
i
	i                                              .'.   /
			I          IK 2TC
 —       »L                        ^             ««rft^..»«rf
				
	tons.
	
				
		
		— 2 65 .
		

	, */                                 .                           .  *          5 ^ -
					
				

	1                ...... ............ ... ........
					
				
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